Some questions regarding the hydrogen sulfide removal stripping tower

It is closely related to pressure changes in the reflux tank; the reflux rate primarily controls the temperature at the top of the tower, thereby adjusting the liquid phase equilibrium point! The gas phase is regulated by the pressure in the reflux tank! The temperature at the top of the tower is reduced to around 40°C through air cooling and water cooling! The pressure in the reflux tank has a significant impact!

First of all, what principle is used in your hydrogen sulfide stripping tower? Is it bottom heating or steam stripping? There is a significant difference between the two； Bottom heating is used to raise the temperature of the oil so that it boils, thereby removing hydrogen sulfide dissolved in the oil ； Steam stripping uses steam to reduce the partial pressure of the oil, thereby lowering its boiling temperature. Because the principles used are different, the results also differ. Stirred-tank distillers generally operate with full reflux; theoretically, there is no need to discharge light hydrocarbons or similar substances. Therefore, the amount of reflux in such distillers cannot be adjusted arbitrarily – instead, the bottom temperature of the tower (which depends on the feed temperature and the amount of steam used) must be adjusted, which in turn leads to other changes. An increase in the amount of material entering the reflux tank will result in some heavier components being carried along as well. It’s a bit off-topic, but an increase in backflow will raise the temperature after air cooling (increasing the air cooling load); C5 is not easy to condense, which leads to an increase in C5 levels in the acidic gases. The increased backflow may cause some of the hydrogen sulfide to dissolve again in the liquid flowing back, resulting in secondary pollution and reducing the efficiency of hydrogen sulfide removal

A significant change in the tower top temperature should have an impact on C5, right? As for full reflux of hydrogen sulfide, it should still be acceptable

Why does an increase in backflow raise the temperature after air cooling? Backflow increases, the top temperature drops; the temperature of the material coming out should be low. Isn’t the temperature low after air cooling?

This is a balance issue; the increase in backflow is due to an increase in the gas phase, as more heat is supplied at the bottom. According to heat balance principles, the air cooling load at the top of the tower increases, and therefore the air cooling temperature rises. (Except when it can be adjusted under full load.)